Products > Test Equipment
Rohde & Schwarz CMU200
ZL1CVD:
Does anyone know the secondary GPIB address for the 2nd RF channel (RX/TX Board 2) in CRTU-RU?
I want to be able to control the RX/TX Board 2 via SCPI
I know secondary GPIB address's can be changed on the CRTU in Setup>>Remote>>Secondary Address [GPIB] screen. However it only shows 1 RF device.
SYST:REM:ADDR:SEC? only reports 1x RF_NSig.
The CRTU-RU documentation doesn't seem to cover SCPI commands which is not surprising as I suspect its mainly addressed directly via Win2K. when you boot in DOS mode, it basically reverts back to a CMU200. I have a CMU200 & CRTU & can't see any difference between CMU200 & CRTU DOS file systems for SCPI remote control.
ZL1CVD:
** RF loop path 1 test failed - FIXED **
Was a faulty power supply. This same power supply would also not start up from standby *sometimes*.
At some point, the CMU had been dropped on the, you guessed it, power supply - it was pushed into the case - housing dented. I have seen the same thing with an older K6 CMU (with PS/2 keyboard port). These older units are much more forgiving for case / transit damage as their motherboard does not go completely to the rear of the case like the newer Celeron CMU or Pentium CRTU units. The rear connections are made via ribbon cable to separate rear PCB strip. I was very lucky that there was no PCB damage on this newer Celeron unit.
Now to figure what pins have what voltage and see if I can find the cracked joint...
richnormand:
--- Quote from: ZL1CVD on April 25, 2017, 11:50:38 am ---** RF loop path 1 test failed - FIXED **
Now to figure what pins have what voltage and see if I can find the cracked joint...
--- End quote ---
If you are talking about the PSU used in the CMU200 and such look up my thread on CMU200 PSU repair from last year. It has full pinout of the connectors and several diagrams. Hope it helps you.
https://www.eevblog.com/forum/repair/rohde-schwartz-universal-radio-communication-tester-cmu200-psu-issues/
CJay:
Bear with me, GPIB newby here...
I've managed to get hold of a PCI GPIB card, cabling and have got my CMU200 to talk to FRERES on Win 10, could someone please show me some screenshots of how you configured it to sweep a filter, complete with devices setting and sweep setting as well as the main FRERES screen?
I'm positive it's something simple I just haven't got a grip on yet but I can't work it out.
CMU is set up for SCPI via GPIB only
Primary address 28
Secondary has RF Non Signalling on address 1
Running a sweep seems to work but the data FRERES displays is noise at -86dBm, regardless of how I loop the RF ports on the CMU.
As I said, it's something simple but I just can't see what I'm doing wrong.
usagi:
what DANL are people seeing with their cmu200?
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